Titlebook: Depth From Defocus: A Real Aperture Imaging Approach; Subhasis Chaudhuri,A. N. Rajagopalan Book 1999 Springer Science+Business Media New Y

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https://doi.org/10.1007/978-94-009-6475-4 blur is estimated by considering the defocusing process to be shift-invariant over that local region. However, each local region is analyzed independently to estimate the depth corresponding to that local region. But splitting an image into independent subimages introduces an error in the estimate

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https://doi.org/10.1007/978-94-009-6475-4g the Fourier transform of a signal by a function ., the transfer function of the filter, to obtain a filtered version of the signal. For time-variant filtering, it is necessary to look for other representations that play a similar role to that of the Fourier transform in the time-invariant case. In

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